Well, the E46 photo that is shown in the auction page has nothing to do with those LEDs, the E46 being on CCFL in that photo. So, it will not look that bright by any means.

The LEDs will mostly turn the rings color from the stock yellowish to white. In terms of brightness, it depends how good the LEDs are, if they are poor, you will barely see them at daylight, compared to the stock ones.